MAX8855A

Dual, 5A, 2MHz Step-Down Regulators

Smallest, Most Efficient 5A Regulators with Integrated Switches in 5mm x 5mm TQFN Package

Data Sheet (Rev. 4)
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Overview

  • 27mΩ On-Resistance Internal MOSFETs
  • Dual, 5A, PWM Step-Down Regulators
  • Fully Protected Against Overcurrent, Short Circuit, and Overtemperature
  • ±1% Output Accuracy Over Load, Line, and Temperature
  • Operates from 2.25V to 3.6V Supply
  • REFIN on One Channel for Tracking or External Reference
  • Integrated Boost Diodes
  • Adjustable Output from 0.6V to 0.9 x VIN
  • Soft-Start Reduces Inrush Supply Current
  • 0.5MHz to 2MHz Adjustable Switching, or FSYNC Input
  • All-Ceramic-Capacitor Design
  • 180° Out-of-Phase Operation Reduces Input Ripple Current
  • Individual Enable Inputs and PWRGD Outputs
  • Safe-Start into Prebiased Output
  • Available in 5mm x 5mm Thin QFN Package
  • Sink/Source Current in DDR Applications
MAX8855A
Dual, 5A, 2MHz Step-Down Regulators
MAX8855/MAX8855A Simplified Block Diagram MAX8855/MAX8855A Typical Application Circuit MAX8855/MAX8855A Functional Diagram MAX8855/MAX8855A PIn Configuration
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Documentation

Data Sheet 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
MAX8688
PRODUCTION Digital Power-Supply Controller/Monitor with PMBus Interface
Product 2
MAX8658
1- to 8-Phase, Master-Slave CPU Core Regulator with Integrated Power MOSFETs
MAX8659
1- to 8-Phase, Master-Slave CPU Core Regulator with Integrated Power MOSFETs
Switching Regulators & Controllers 8
MAX8646
PRODUCTION 6A, 2MHz Step-Down Regulator with Integrated Switches
MAX8833
PRODUCTION Dual, 3A, 2MHz Step-Down Regulator
MAX8855
PRODUCTION Dual, 5A, 2MHz Step-Down Regulators
MAX1945
PRODUCTION 1MHz, 1% Accurate, 6A Internal Switch Step-Down Regulators
MAX1951
PRODUCTION 1MHz, All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators
MAX8505
PRODUCTION 3A, 1MHz, 1% Accurate, Internal Switch Step-Down Regulator with Power-OK
MAX1974
PRODUCTION Smallest 1A, 1.4MHz Step-Down Regulators
MAX1972
PRODUCTION Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-Down Regulator with POR and RSI/PFO
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Evaluation Kits

MAX8855EVKIT

Evaluation Kit for the MAX8855

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Features and Benefits

  • 2.35V to 3.6V Input Supply Voltage Range
  • 1.8V at 5A Output (Step-Down Regulator 1)
  • 1.2V at 5A Output (Step-Down Regulator 2)
  • 180° Out-of-Phase Operation Reduces Input Ripple Current
  • All-Ceramic-Capacitor Design
  • High Efficiency
  • 27mΩ On-Resistance Internal MOSFETs
  • Fully Protected Against Overcurrent, Short Circuit, and Overtemperature
  • REFIN on One Channel for Tracking or External Reference
  • Integrated Boost Diodes
  • Programmable Switching Frequency from 0.5MHz to 2MHz
  • Adjustable Outputs from 0.6V to (0.9 x VIN)
  • Individual Enable Inputs and PWRGD Outputs
  • Low-Cost Solution
  • Fully Assembled and Tested

Product Details

The MAX8855 evaluation kit (EV kit) is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX8855. The device is a high-efficiency dual step-down regulator. The EV kit is powered from a 2.35V to 3.6V DC supply.

The EV kit is capable of delivering 1.8V at 5A from output 1 and 1.2V at 5A from output 2. The device switching frequency is set to 1MHz and the two outputs switch 180° out-of-phase. High-efficiency, internal dual nMOS design keeps the board cool under heavy loads. The voltage-mode control architecture and the high-bandwidth (> 15MHz typ) voltage-error amplifier allow a type III compensation scheme to be utilized to achieve fast response under both line and load transients, and also allow for ceramic output capacitors.

Programmable soft-start reduces input inrush current. Two enable inputs allow the turning on/off of each output individually, resulting in great flexibility for system-level designs. A reference input facilitates output-voltage tracking applications.

Applications

  • ASIC/CPU/DSP Power Supplies
  • DDR Power Supplies
  • Network Power Supplies
  • Printer Power Supplies
  • Set-Top Box Power Supplies
MAX8855EVKIT
Evaluation Kit for the MAX8855

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